Draw a tree diagram to represent the terms and factors for the following algebraic expression.
$3a^2-b+2$

Identify the like terms in the following.

$8{\mathrm{p}}^2, 3{\mathrm{q}}^2, -2\mathrm{r}, 7\mathrm{pq}, -{\mathrm{p}}^2, 2{\mathrm{q}}^2, -3\mathrm{t}$

Identify the monomial, binomial and trinomial from the following algebraic expression.

$71\mathrm{x}+75\mathrm{y}-15\mathrm{z}$